Section 18 OPTICAL, PHOTOGRAPHIC, CINEMATOGRAPHIC, MEASURING, CHECKING, PRECISION, MEDICAL OR SURGICAL INSTRUMENTS AND APPARATUS; CLOCKS AND WATCHES; MUSICAL INSTRUMENTS; PARTS AND ACCESSORIES THEREOF 90 OPTICAL, PHOTOGRAGHIC, CINEMATOGRAPHIC, MEASURING, CHECKING, PRECISION, MEDICAL OR SURGICAL INSTRUMENTS AND APPARATUS; CLOCKS AND WATCHES; MUSICAL INSTRUMENTS; PARTS AND ACCESSORIES THEREOF 90 22 USES, INCLUDING RADIOGRAPHY OR RADIOTHERAPHY APPARATUS, X-RAY TUBES AND 90 22 13 OTHER APPARATUS BASED ON THE USE OF X-RAYS, FOR DENTAL USES Commodity Code Description 90 22 13 00 OTHER APPARATUS BASED ON THE USE OF X-RAYS, FOR DENTAL USES